The London Underground will be blanketed in WiFi by the end of this month, Three UK Director of Customer Strategy, Danny Dixon, has revealed. Speaking with TechRadar, Dixon confirmed Three will begin offering free public WiFi in 137 Underground stations. Those stations will begin seeing the WiFi service in July, and other stations could also receive free WiFi service later this year.

Three UK is working with Virgin Media to provide the free WiFi access, since Virgin’s infrastructure is more capable of providing the service. Deals to get WiFi into the Underground stations have been setup by many carriers throughout London. Among the carriers interested in offering WiFi to people in the Underground are EE, Vodafone, and O2.

At least some stations have been covered with WiFi through earlier deals since 2012. Paywalls had also been introduced in 2012 and 2013 which prevented some people from using the public WiFi service without paying, unless they were customers of EE, Virgin, or Vodafone. With Three UK offering WiFi service as well, those customers will be able to utilize the public WiFi for free rather than paying for it.

Three says that ticket halls, corridors, and platforms will all be covered once the rollout takes place in the coming weeks.